Crushing-mill.



T. L. & T. J. STURTEVANT.

GRUSHING MILL.

APPLICATION FILED NOV. 12, 1910.

1,083,951. Patented Jam 13, 191;

8 SHEETS-SHEET 1.

l6 WIT/VB 5E INVENTORY: -y 6 Z22 aaw COLUMBIA PLANodl/um COHWASNINGTBN.D C.

T. L. & T. J. STURTEVANT. CRUSHING MILL.

APPLICATION IILEI) 11011.12, 1910.

1,083,951. Patented Jan. 13, 191 1.

8 BHEETSSHEET 2.

F/E. 4A f/EJT WJTNE [NVENTORJZ' COLUMIIA PLANOORAHI CO" WASHINGTON, D-C.

T. L. & T. J. STURTEVANT.

CRUSHING MILL.

APPLICATION I'ILED NOV. 12, 1910.

IIII/I/Ill Alfomgu,

UNITED sra'ras Pagans? OFFICE.

THOMAS LEGGETT STURTEVANT, OF QUINCY, AND THOMAS JOSEPH STURTEVANT, OFWELLESLEY, MASSACHUSETTS, ASSIGNORS TO STURTEVANT MILL COMPANY, A.

CORPORATION OF MAINE.

CRUSI-IING-MILL.

oeaoar.

To aZZ whom it may concern:

Be it known that we, THOMAS L. S'rmmr VANT and TrIoMAs J. STURTEVANT,citizens of the United States, residing, respectively, at Quincy andVVellesley, in the county of Norfolk and State of Massachusetts, haveinvented or discovered certain new and useful Improvements inCrushing-Mills, of which the following is a specification, refer onesbeing had therein to the accompanying drawings.

This invention relates to that class of crushing mills such as thoseshown by our Patent No. 906,829, granted December 15, 1908, and ourpending application Serial No. 441,857, filed July 8, 1908, and in whichthe material to be reduced is fed to a rotating anvil ring against theinner face of which it is crushed by cooperating rolls which are forcedoutwardly, by spring pressure, toward the mterior surface of the saidring. These rings are preferably carried by spoked or openwork heads sothat the crushed material is discharged from both sides of the rotatingrings, but in this class of mills there is a considerable loss ofefiiciency by the material tumbling ofi or escaping from the ringsbefore it passes to the rolls, or before it is properly reduced; and thepresent invention has for its main object to improve the efficiency ofthis class of mills by providing means for preventing the too earlyescape of the material from the rotating anvil rings. This object iseffected by a peculiar construction of the anvil ring, or of the feedspout by which the material is fed to the ring, or of the crushing rollscooperating with the ring, but preferably by all of these means, as willhereinafter more fully appear.

In the accompanying drawings Figure 1 illustrates a preferred form ofanvil ring with feed spout and cooperating crushing rolls. Fig. 2 is asection of the same, on line 22, Fig. 1, and Fig. 8 is a section on line33, Fig. 1. Figs. 4 and 5 are detail perspective views of the form offeed spout s own in Figs. 1 and 2, and Figs. 6 and 7 are detail views ofanother form of feed spout. Fig. 8 is a longitudinal section of acrushing machine in which the present improvements are embodied, andFig. 9 is a detail view of the feed regulating device of said machine.

Referring to the drawings, 12 denotes the anvil ring which willpreferably be con- Specification of Letters Patent.

Application filed November 12, 1910.

Patented Jan. 13, 1914:. Serial No. 592,116.

structedwith a transversely concave inner or crushing face, and willalso preferably be prov ded at one edge with an lnwardly extendlng orradial annular lip or flange 13. The material to be crushed is fed tothe inner face of the anvil ring through a feed spout 14 which is curvedor off-set to one side at its lower end so that it may extend within theanvil ring in such a manner that ts discharge portion or mouth isbrought into a position at or near the transverse central portion-of thering, so as to deliver the material to the middle of the track of thermg as nearly as possible. This feed spout 1S preferably provided at oneside of its lower end with a curved shield or guard 15 which is on aline with, or in the plane of one slde of the ring, or approximately so,and which will prevent the material from escaping at that side of thering; the inwardly projecting flange 13 preventing the too ready escapeof the material from the opposite side of the ring. The outer edge ofthe shield or guard is curved to conform to the inn-er face of the anvilring 12, or approximately so, and is arranged closely ad acent to saidface. Said shield or guard 15 may be formed integral with the feedspout, as shown in Figs. 2, t and 5, or it may be formed separate fromsaid spout and be detachably secured thereto, as in the constructionillustrated in Figs. 6 and 7. To prevent the tendency of the material toescape from the anvil ring, the roll 16, which is next to the feedspout, is preferably constructed with a grooved or transversely concaveface which will act upon the incoming material in such a manner as tosqueeze it together and crush it somewhat. The second roll 17, to whichthe material is next delivered, is preferably provided with atransversely flat face, which, in cooperation with the transverselyconcave face of the anvil ring, will still further crush the material,while not unnecessarily crowding the same off the ring. The third roll18 is preferably provided with a transversely convex face conformingclosely in curvature to the concave face of the anvil ring, and if themachine is to include four crushing rolls the fourth roll may also havea convex crushing face. If desired the grooved roll may be omitted andonly transversely flat and convex faced rolls be employed, to goodeffect, in cooperation with the transversely concave anvil ring. By thusproviding crushing rolls, having faces of different configuration, theefficiency of the mill is greatly increased in that the different facedrolls acting successively on the material will each cut its own path orroadway so as to act more destructively than is the case with rollshaving similar faces, and in that the material will have a greatlylessened tendency to be discharged from the anvil ring before it hasbeen properly reduced. Thus with the use of crushing rolls having facesof different configuration and acting successively on the material to bereduced the tendency to compact the material on the anvil ring islessened, as each different-faced roll, in cutting a different path, hasa tendency to tear up the material rather than to compact it. Thisefficiency of the mill is also augmented by the shield 15 of the feedspout, or by the inwardly extending flange 13 of the anvil ring, or byboth of these features which will preferably be employed in connectionwith the crushing rolls having differently formed faces, as abovedescribed. These crushing rolls having differently formed faces, orfaces of different contours, are, in practice, forced outward toward theinner or crushing face of the anvil ring by spring pressure, as fullyshown and described in our patent and application above referred to; andas also indicated in Fig. 8 which shows one of the springs 19 which acton the bell-crank roll-carriers 20 to force the rolls outward toward thecrushing face of the anvil ring 12 on the rotating anvil ring carrier11.

The convex faced roll 18 will preferably be arranged at a slight angleto the anvil ring, as shown in Figs. 3 and 8, so as to have a scuflingor rubbing action in addition to its pressing crushing action, therebystill further contributing to the efliciency of the machine in effectingrapid reduction of the material; and if two transversely convex facedrolls be employed they may both be arranged to act as scufling crushingrolls.

The feed spout l4 conducts the material to be crushed from a hopper 21to the anvil ring, the feed of the material being regulated by a feedslide 22 which will be so adjusted that the feed spout will not beclogged, thereby permitting the entering material to be dischargedtangentially from the feed spout to the anvil ring, in the generaldirection of rotation of the latter, with a velocity approximating thespeed of rotation of the anvil ring, so as to lessen the inertia betweenthe moving ring and the material, and which inertia not only tends to adischarge of the material from the anvil ring but causes wear on thering by the slip of the hard sharp material thereon. The feed slide isprovided with a pin 23 to enter a slot at the elbow of a regulatinglever 24: pivoted at 25 to the hopper. The feed slide may be locked inany position to which it may be adjusted by means of an adjustable blockor collar 26 mounted on a hinged bar 27 and provided at its lower sidewith a notch for engagement with the pin 23 on the feed slide. Theadjustable block 26 may be secured in any desired position by means of aset screw 29, thus permitting the feed slide to be locked in anyposition to which it may be adjusted, the sliding block or collar 26being of course adjusted on the hinged bar 27 to a positioncorresponding to the position of adjustment of the feed slide.

It will be understood that the present invention of the differentlyfaced rolls, the flanged anvil ring and the cooperating feed spout, maybe applied to an anvil ring and cooperating rolls rotating either in avertical or horizontal plane; and if the invention be applied to a ringwhich rotates in a horizontal plane the inwardly extending flange 13 onthe anvil ring will preferably be arranged at the lower side thereof;and in such case the feed spout will be correspondingly constructed sothat its shield 15 will be arranged at the upper side of the ring.

Having thus described our invention we claim and desire to secure byLetters Patent:

1. In a crushing mill, the combination with an anvil ring, of a feedspout having a discharge opening arranged to deliver material to thecentral portion of said ring and which feed spout is provided at oneside with a curved shield or guard arranged closely adjacent to the edgeof the curved inner face of said ring and conforming in shape to thesaid edge, or substantially so.

2. In a crushing mill, the combination with an anvil ring having aninwardly extending annular lip or flange at one side, of a feed spout todeliver material to the said ring and which feed spout is provided atone side with a curved shield or guard which is arranged at the oppositeside of said ring from said lip or flange.

3. In a crushing mill, the combination with a rotating anvil ring havinga transversely concave inner or crushing face, and a feed spout fordelivering material to said ring, of a series of rolls pressedyieldingly outward toward said ring for the crushing operation, that oneof said rolls which is nearest to the delivery end of the said feedspout being constructed with a concave or grooved outer face cooperatingdirectly with said ring.

41-. In a crushing mill, the combination with an anvil ring having atransversely concave inner or crushing face, and a feed spout fordelivering material to said ring, of a series of rolls cooperating withsaid ring for the crushing operation, that one of said rolls which isnearest to the delivery end of the said feed spout being constructedwith a concave or grooved outer face and that one of said rolls to whichthe material will next pass in the crushing operation being providedwith a transversely fiat crushing face.

5. In a crushing mill, the combination with an anvil ring having atransversely concave inner or crushing face, and a feed spout fordelivering material to said ring, of a series of rolls cooperating withsaid ring for the crushing operation, that one of said rolls which isnearest to the delivery end of the said feed spout being constructedwith a concave or grooved outer face, that one of said rolls to whichthe material will next pass in the crushing operation being providedwith a transversely flat crushing face, and that one of said rolls towhich the material next passes being provided with a transversely convexouter'face.

6. In a crushing mill, the combination with an anvil ring having atransversely curved concave inner face, of a crushing roll having atransversely fiat outer face cooperating with the sald transverselycurved concave face of said anvil ring.

7. In a crushing mill, the combination with an anvil ring having atransversely concave inner face, of a cooperating crushing roll having atransversely flat outer face cooperating with the concave face of saidanvil ring, and one or more crushing rolls having a transversely convexouter face or faces.

8. In a crushing mill, the combination with an anvil ring having atransversely concave inner face, of a cooperating crushing roll having atransversely flat face, and a following cooperating roll having atransversely convex face, said last-named roll being inclined relativeto said ring so as to act as a scufling crushing roll.

9. In a crushing mill, the combination with an anvil ring having atransversely concave inner face, of a cooperating crushing roll having atransversely concave face, a second cooperating crushing roll having atransversely flat face, and a following cooperating roll having atransversely convex face, said last-named roll being inclined relativeto said ring so as to act as a scufiing crushing roll.

10. In a crushing mill, the combination with a rotating anvil ring, of aseries of crushing rolls all cooperating directly with said ring andhaving faces of difierent contours and to which rolls the material to becrushed will be successively presented between said rolls and ring.

11. In a crushing mill, the combination with a rotating anvil ringhaving a transversely concave inner or crushing face, of a series ofcrushing rolls all cooperating directly with said ring and having facesof different contours, and to which rolls the material to be crushedwill be successively presented between said rolls and ring.

In testimony whereof We afiix our signatures, in presence of twowitnesses.

THOMAS LEGGETT STURTEVANT. THOMAS JOSEPH STURTEVANT.

Witnesses:

W. Y. ELLIS, GRACE G. GODFREY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

